import numpy as np

arr_3d = np.array([[[1, 2, 3], [4, 5, 6], [7, 8, 9]],
                   [[10, 11, 12], [13, 14, 15], [16, 17, 18]],
                   [[19, 20, 21], [22, 23, 24], [25, 26, 27]],
                   [[19, 20, 21], [22, 23, 24], [25, 26, 27]]])
# print(arr_3d.shape)
result = arr_3d[:,:,1]
print(result)
